Esthetics (also spelled aesthetics) is a subdiscipline of value theory or axiology, which is a branch of philosophy that studies sensory values, sometimes called judgments of sentiment or taste. Esthetics is closely associated with the philosophy of High Art. Esthetics includes art as well as the very purpose behind it. Esthetics as a branch of philosophy studies art, the methods of evaluating art, and judgments of art. Art has existed through all recorded human history. Art is unique to human beings because of our innate ability to abstract. Esthetics is important because it examines the reasons why art has always existed and attempts to bring clarity to a vastly complex intellectual human.